Zucchini Cake

1/2 cup margarine
1/2 cup oil
1 1/3 cup sugar
2 eggs
1/2 cup sour cream
1 tsp vanilla
2 1/2 cup flour
4 TB cocoa
1/2 tsp salt
1/2 tsp baking powder
1/2 tsp soda
2 cups shredded zucchini
Chocolate chips on top

Put in a greased and floured 9 x 13 pan. Sprinkle with chocolate chips. Bake at 325 degrees for 50-60 minutes. Let cool and sprinkle with powdered sugar.